# Does Site Use Prebid.js

> Does Site Use Prebid.js is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).

Detects whether a given website uses Prebid.js by fingerprinting its homepage HTML and response headers, returning a yes/no result with evidence snippet.

## Facts

- Endpoint: GET https://site.intel.rallylive.ca/site/uses/prebid?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/does-site-use-prebid-js-b764fb33
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RM6OWloctdsaBqRsQNHfn

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability does-site-use-prebid-js-b764fb33
```

Example prompt: Can you check whether theguardian.com uses Prebid.js for header bidding? I want to know if they're running Prebid and see any evidence found in their page.

## When to prefer this

Use this endpoint when you need a fast, low-cost ($0.01) single-domain check for Prebid.js specifically. Prefer this over generic web scraping when you want a structured yes/no technographic signal with evidence, especially for sales prospecting, competitive intelligence, or ad-stack auditing workflows. Use the sibling bulk endpoint if checking more than a few domains at once.

## Known failure modes

- Domain is unreachable or returns non-200 status — check may return no result or error
- Website uses bot detection/WAF that blocks the fetch, resulting in false negative
- Prebid.js loaded asynchronously after initial HTML render may not be detected
- Highly customized or obfuscated Prebid.js builds may evade fingerprint matching
- Invalid or malformed domain input causes request failure

## How this service works

Does a website use Prebid.js? Fetches the page (homepage for a bare domain) and matches Prebid.js's fingerprints in the HTML and response headers, returning yes/no with the evidence snippet and the category (advertising). Technographics for sales, competitor research and migration planning, one technology per call. $0.01 per check.

## Output

Returns a yes/no boolean indicating whether Prebid.js was detected on the website, along with the specific evidence snippet (e.g. matching HTML pattern or response header value) that triggered the match, and the technology category label 'advertising'.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/does-site-use-prebid-js-b764fb33/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from site.intel.rallylive.ca](https://www.zero.xyz/host/site.intel.rallylive.ca/llms.txt)